Looper mechanism for sewing-machines.



J. R. MOFFAT. [OOPER MECHAN'SNI FOR SEWING MACHINES.

APPLICATION FILED DEC. 14. 191-5.

LM? l mmm Nov. 2?, 1917.

2 SHEETS-SHEET I.

Elven/107,

1. R. MOFFATT. LOOPER MECHANISM FOR SEWING MACHINES. APPLXCATIQN FILEDDEC. i4. 1915. l 11.4@,W 'Patented Nov. 2?, um.

2 SHEETS-SHEET 2.

@FFMEE JAMES R. MOFFATT, 0F CHICAGO, LLNGIS, .SSGNDR TO UNION SPECIALMACHNE COMPANY, 0F CHICAGO, LLNGS, A CORPORATION OF ILLIN 01S.

LOOPEB vIECliliAli'T/ FOR SEWING-MACHINES.

Application filed December 14, 1915.

To all whom t may concern:

Be it known that I, JAMES R. MOFFATT, a citizen of the United States,residing at Chicago, in the county of Cook, State of Illinois, haveinvented certain new and useful Improvements in Looper Mechanisms forSewing-Machines, of which the following is a description, referencebeing had to the accompanying drawing and to 'the figures of referencemarked thereon.

The invention relates to new and useful improvements in loopermechanisms for sew ing machines, and more particularly to the supportingmechanism for a thread carrying looper.

An object of the invention is to provide a supporting means for thelooper carrier which is so constructed that the looper carrier may beremoved from the supporting means on which it oscillates withoutdisturbing or disconnecting said supporting means.

A further object of the invention is to provide a looper supportingmeans wherein the supporting stud for the looper carrier, together withthe supporting bearings carried by the stud, may be detached from thelooper rocker on which the stud is mounted.

A still further object of the invention is to provide a supporting meansfor a looper carrier wherein the cone bearings on which the loopercarrier oseillates may be adjusted relative to each other withoutdisturbing or changing the connection between the supporting stud onwhich the bearings are mounted and the looper rocker which carries saidsupporting stud.

These and other objects will in part be obvious and will in part behereinafter more fully disclosed. Y

In the drawings, which show by way of illustration one embodiment of theinvention:-

Figure l is a view in front elevation showing a portion of a sewingmachine having the improved looper supporting mechanism applied thereto;

Fig. 2 is an enlarged front elevation of the looper carrier, a portionof the loo er rocker, and the supporting means on which the loopercarrier is mounted;

Fig. 3 is a plan view of the looper rocker, and the supporting stud enwhich the looper carrier is mounted;

Specification of Letters Patent.

ul5*atented Nov. 2*?, 494 Fl..

Serial No. 66,782.

Fig. 4 is a view in section through the looper rocker and the loopercarrier showing the supporting stud and the bearings for the loopercarrier; and

Fig. 5 is a perspective view with the parts separated, showing thelooper rocker, the looper supporting stud, and the bearings for thelooper carrier.

Prior to my invention, it has been cus* tomary to provide a looperrocker which is mounted in bearings so that said looper rocker may beoscillated, and on this looper rocker is mounted a looper carrier. Thelooper carrier is connected to the looper rocker by a pivotal supportingbearing so that the carrier may oseillate. The oscillation of thecarrier causes the looper to enter and leave the needle loops while theoscillation of the looper rocker gives to the looper its needle avoidingmovement. The present invention is directed to the manner of supportingthe looper carrier on the looper rocker, and consists of a detachablesupporting stud which is secured to the looper rocker by a threaded nutor the like, and this supporting stud carries the inner and outerbearings for the looper carrier. The outer bearing for the loopercarrieris also adjustably and detachably connected to the supportingstud so that it may be removed for removing the looper carrier. lThispermits the bearings for the looper carrier to be relatively adjustedwithout disturbing the connection between the supporting stud and thelooper rocker. It also permits the bearings, which are entirelyindependent of the looper rocker, to be made and tempered separatelyfrom the looper rocker.

Referring more in detail to the drawings, the invention is shown appliedto a sewing machine having a supporting bed l, in which is mounted torotate a main shaft 2. Mounted in suitable bearings in the supportingbed is a looper rocker 3. Pivotally attached to said looper rocker is alooper carrier 4 on which is mounted a threaded looper 5. Coperatingwith said threaded looper is a needle 6 which is reciprocated in theusual manner. The looper carrier 4 is oscillated by a link 7, while thelooper roeker is oscilla-ted from a suitable eccentric on the main shaft2.

The vlooper rocker 3 is provided with spaced bearing sleeves 8 and 9,and a lateral offset section in which is formed a circular recess 10 andan opening 11. The Vlooper carrier 4 is mounted on a supporting stud 12.This supporting stud 12 carries cone bearings 13 and 14 on which thelooper carrier is directly mounted. The cone bearing 13 is formedintegral with the stud and is shaped to fit the recess 10. The 4base ofthe cone bearing is adapted to rest against the side face of the recess10, and a nut 15 screwed onto the .threaded end of the stud 12 firmlyclamps the stud to the looper rocher. rlhe outer cone bearing 14 isadjustably and detachably connected to the Stud 12. Said cone bearing isconnected to a sleeve which carries set-screws 16 and 17. @ne face ofthe stud is flattened at 18, and the removable cone bearing is sopositioned that one yof .the set-screws will engage this flattenedsurta-ce and thereby lock said cone against radial movement relative tothe stud. The youter end 19 of the stud 12 is threaded and receives alock nut 20.

From the above construction, it will be apparent that the outer conebearing may be removed and the carrier replaced on the stud, after whichthis Vouter cone bearing may be secured to the stud in proper positionto support the looper carrier. As the parts wear said outer bearing maybe adjusted to take up the wear. rllhis adjustment .to take up the wearis accomplished without disturbing the set position of the stud on thelooper rocker and without disturbing the bearing relation between thecones and the looper' carrier. It often occurs that there are certaininaccuracies in the threads which hold Athe stud to the looper rocker,and when a .threaded connection between the stud and the looper rockeris .depended upon for adjustment to taire up wear, the bearing surfacesof the cones are thrown out of alinement. By this improvement, however,where the stud when first connected to .the looper rocker always retainsits setting, there is no liability of throwing `the parts out ofalinement when adjustment is made tor wear. It also often occurs in thetempering of parts that projecting parts are distorted. In other types,when .the looper-supporting stud, together with its inner cone bearing,is formed integral with the looper rocker, the tempering of t-he partsoften throws the same out of alinement. By the improved construction,however, when the inner cone is formed integral with the supportingstud, there is no liability of distorting the parts during tempering.

It is obvious that minor changes in the details of construction and thearrangement of parts maj7 be made without departing from the spirit ofthe invention as set forth in the appended claims.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is:

1. The combination of a looper rocker, a looper carrier, and means forsupporting said looper carrier on said looper rocker, said meansincluding a supporting stud detachably connected to said looper rocker,and devices whereby said looper carrier may be removed from thesupporting stud without detaching said supporting stud from said looperrocker.

2. The combination of a looper rocker, a looper carrier, a supportingstud on which said looper carrier is mounted, said supporting studhaving an inner cone bearing for said looper carrier formed integraltherewith, devices for detachably connecting said stud to said looperrecher, yand an outer cone bearing for said looper carrier .adjustablyconnected to the outer end of said supporting stud.

3. The combination of a looper rocker, a looper carrier, a supportingstud on which said looper carrier is mounted, .an inner cone bearing forsaid looper carrier attached to said supporting stud, said supportingstud having a threaded end projecting beyond said cone bearing, saidlooper rocker having a seat for the base of said cone bearing, andhaving an opening through which said threaded end of the stud extends,.a'locking nut tor holding said stud on the rocker, and an adjustableouter cone bearing for said looper carrier securedV to ythe outer end ofsaid stud.

4:. The combination of a looper rocker, a looper carrier, a supportingstud on which said looper carrier is mounted, an inner cone bearing forsaid looper' carrier attached to said supporting stud, said supportingstud having a threaded end projecting beyond said cone bearing, saidlooper rocker having a seat for the base of said cone bearinf, andhaving an opening through which said threaded end of the stud extends, alocking nut for holding said st udon the rocker, an adjustable outercone bearing for said looper carrier mounted on the outer end of saidstud, said stud having Va threaded end projecting beyond the adjustablecone bearing, and a. lock nut engaging the last-mentioned threaded endoit the stud and .engaging the outer face of said adjustable conebearing.

In testimony whereof, I aiiiX my signature, in the presence of twowitnesses.

JAMES R. MOFFATT. iVitnesses:

S. GEORGE Tarn, A. F. BRnDsi-IALL.V

Gopies of this patent may be obtained for ve cents each, by addressingthe Commissioner of latents. Washington, D. C.

